Vintage Dirt Bike Q & A

Hi

I need a piston and rings for a 1975 Suzuki TM 125 .040 over bore.

LEEl

I have a NOS Genuine Suzuki piston for TM125 part no 12110-41731-050. 50 over, of course. I also have NOS Genuine Suzuki rings 12140-28011-050.
But here's the odd thing: The ring lands on the piston are so narrow. I've never seen anything like it. And the rings are too thick for this piston. The rings look normal to me.
So which is wrong, I don't know. Both are in Suzuki packaging. But I thought I'd throw it out there to see if this made sense to you. The piston measures 56.44mm by the way.
If I can help, let me know.

My friend used to ride a J&B Honda 125. They used to put TM 125 pistons in his bike as they were stronger. If you can't find a TM piston, maybe a CR piston/rings will fit.
Just an idea.
Oh, 3 weeks on a TM piston on the J&B Honda, which was one more race weekend than on the CR piston. (i love technology today)

Rick